﻿//
// System.Web.Util.StrUtils
//
// Author(s):
//  Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2005 Novell, Inc, (http://www.novell.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Globalization;
using System.Text;

namespace Griffin.Networking.Protocol.Http.Services.BodyDecoders.Mono
{
    internal static class StrUtils
    {
        public static bool StartsWith(string str1, string str2)
        {
            return StartsWith(str1, str2, false);
        }

        public static bool StartsWith(string str1, string str2, bool ignore_case)
        {
            var l2 = str2.Length;
            if (l2 == 0)
                return true;

            var l1 = str1.Length;
            if (l2 > l1)
                return false;

            return (0 == String.Compare(str1, 0, str2, 0, l2, ignore_case, CultureInfo.InvariantCulture));
        }

        public static bool EndsWith(string str1, string str2)
        {
            return EndsWith(str1, str2, false);
        }

        public static bool EndsWith(string str1, string str2, bool ignore_case)
        {
            var l2 = str2.Length;
            if (l2 == 0)
                return true;

            var l1 = str1.Length;
            if (l2 > l1)
                return false;

            return (0 == String.Compare(str1, l1 - l2, str2, 0, l2, ignore_case, CultureInfo.InvariantCulture));
        }

        public static string EscapeQuotesAndBackslashes(string attributeValue)
        {
            StringBuilder sb = null;
            for (var i = 0; i < attributeValue.Length; i++)
            {
                var ch = attributeValue[i];
                if (ch == '\'' || ch == '"' || ch == '\\')
                {
                    if (sb == null)
                    {
                        sb = new StringBuilder();
                        sb.Append(attributeValue.Substring(0, i));
                    }
                    sb.Append('\\');
                    sb.Append(ch);
                }
                else
                {
                    if (sb != null)
                        sb.Append(ch);
                }
            }
            if (sb != null)
                return sb.ToString();
            return attributeValue;
        }

        public static bool IsNullOrEmpty(string value)
        {
#if NET_2_0
			return String.IsNullOrEmpty (value);
#else
            return value == null || value.Length == 0;
#endif
        }

        public static string[] SplitRemoveEmptyEntries(string value, char[] separator)
        {
#if NET_2_0
			return value.Split (separator, StringSplitOptions.RemoveEmptyEntries);
#else
            var parts = value.Split(separator);
            var delta = 0;
            for (var i = 0; i < parts.Length; i++)
            {
                if (IsNullOrEmpty(parts[i]))
                {
                    delta++;
                }
                else
                {
                    if (delta > 0)
                        parts[i - delta] = parts[i];
                }
            }
            if (delta == 0)
                return parts;

            var parts_copy = new string[parts.Length - delta];
            Array.Copy(parts, parts_copy, parts_copy.Length);
            return parts_copy;
#endif
        }
    }
}